gcc/ada/env.c - gcc - Git at Google

 /****************************************************************************
  *                                                                          *
  *                         GNAT COMPILER COMPONENTS                         *
  *                                                                          *
  *                                  E N V                                   *
  *                                                                          *
  *                          C Implementation File                           *
  *                                                                          *
  *            Copyright (C) 2005-2015, Free Software Foundation, Inc.       *
  *                                                                          *
  * GNAT is free software;  you can  redistribute it  and/or modify it under *
  * terms of the  GNU General Public License as published  by the Free Soft- *
  * ware  Foundation;  either version 3,  or (at your option) any later ver- *
  * sion.  GNAT is distributed in the hope that it will be useful, but WITH- *
  * OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY *
  * or FITNESS FOR A PARTICULAR PURPOSE.                                     *
  *                                                                          *
  * As a special exception under Section 7 of GPL version 3, you are granted *
  * additional permissions described in the GCC Runtime Library Exception,   *
  * version 3.1, as published by the Free Software Foundation.               *
  *                                                                          *
  * You should have received a copy of the GNU General Public License and    *
  * a copy of the GCC Runtime Library Exception along with this program;     *
  * see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    *
  * <http://www.gnu.org/licenses/>.                                          *
  *                                                                          *
  * GNAT was originally developed  by the GNAT team at  New York University. *
  * Extensive contributions were provided by Ada Core Technologies Inc.      *
  *                                                                          *
  ****************************************************************************/

 #ifdef IN_RTS
 # include "tconfig.h"
 # include "tsystem.h"

 # include <sys/stat.h>
 # include <fcntl.h>
 # include <time.h>
 # ifdef VMS
 #  include <unixio.h>
 # endif
 /* We don't have libiberty, so use malloc.  */
 # define xmalloc(S) malloc (S)
 #else /* IN_RTS */
 # include "config.h"
 # include "system.h"
 #endif /* IN_RTS */

 #if defined (__MINGW32__)
 #include <stdlib.h>
 #endif

 #if defined (__APPLE__) && !defined (__arm__)
 /* On Darwin, _NSGetEnviron must be used for shared libraries; but it is not
    available on iOS.  */
 #include <crt_externs.h>
 #endif

 #if defined (__vxworks)
   #if defined (__RTP__)
     /* On VxWorks 6 Real-Time process mode, environ is defined in unistd.h.  */
     #include <unistd.h>
   #elif defined (VTHREADS)
     /* VTHREADS mode applies to both VxWorks 653 and VxWorks MILS. The
        inclusion of vThreadsData.h is necessary to workaround a bug with
        envLib.h on VxWorks MILS and VxWorks 653.  */
     #include <vThreadsData.h>
     #include <envLib.h>
   #else
     /* This should work for kernel mode on both VxWorks 5 and VxWorks 6.  */
     #include <envLib.h>

     /* In that mode environ is a macro which reference the following symbol.
        As the symbol is not defined in any VxWorks include files we declare
        it as extern.  */
     extern char** ppGlobalEnviron;
   #endif
 #endif

 #ifdef __cplusplus
 extern "C" {
 #endif

 #ifdef VMS
 #include <vms/descrip.h>
 #endif

 #include "env.h"

 void
 __gnat_getenv (char *name, int *len, char **value)
 {
   *value = getenv (name);
   if (!*value)
     *len = 0;
   else
     *len = strlen (*value);

   return;
 }

 /* VMS specific declarations for set_env_value.  */

 #ifdef VMS

 typedef struct _ile3
 {
   unsigned short len, code;
   __char_ptr32 adr;
   __char_ptr32 retlen_adr;
 } ile_s;

 #endif

 void
 __gnat_setenv (char *name, char *value)
 {
 #if defined (VMS)
   struct dsc$descriptor_s name_desc;
   $DESCRIPTOR (table_desc, "LNM$PROCESS");
   char *host_pathspec = value;
   char *copy_pathspec;
   int num_dirs_in_pathspec = 1;
   char *ptr;
   long status;

   name_desc.dsc$w_length = strlen (name);
   name_desc.dsc$b_dtype = DSC$K_DTYPE_T;
   name_desc.dsc$b_class = DSC$K_CLASS_S;
   name_desc.dsc$a_pointer = name; /* ??? Danger, not 64bit safe.  */

   if (*host_pathspec == 0)
     /* deassign */
     {
       status = LIB$DELETE_LOGICAL (&name_desc, &table_desc);
       /* no need to check status; if the logical name is not
          defined, that's fine. */
       return;
     }

   ptr = host_pathspec;
   while (*ptr++)
     if (*ptr == ',')
       num_dirs_in_pathspec++;

   {
     int i, status;
     /* Alloca is guaranteed to be 32bit.  */
     ile_s *ile_array = alloca (sizeof (ile_s) * (num_dirs_in_pathspec + 1));
     char *copy_pathspec = alloca (strlen (host_pathspec) + 1);
     char *curr, *next;

     strcpy (copy_pathspec, host_pathspec);
     curr = copy_pathspec;
     for (i = 0; i < num_dirs_in_pathspec; i++)
       {
 	next = strchr (curr, ',');
 	if (next == 0)
 	  next = strchr (curr, 0);

 	*next = 0;
 	ile_array[i].len = strlen (curr);

 	/* Code 2 from lnmdef.h means it's a string.  */
 	ile_array[i].code = 2;
 	ile_array[i].adr = curr;

 	/* retlen_adr is ignored.  */
 	ile_array[i].retlen_adr = 0;
 	curr = next + 1;
       }

     /* Terminating item must be zero.  */
     ile_array[i].len = 0;
     ile_array[i].code = 0;
     ile_array[i].adr = 0;
     ile_array[i].retlen_adr = 0;

     status = LIB$SET_LOGICAL (&name_desc, 0, &table_desc, 0, ile_array);
     if ((status & 1) != 1)
       LIB$SIGNAL (status);
   }

 #elif (defined (__vxworks) && defined (__RTP__)) || defined (__APPLE__)
   setenv (name, value, 1);

 #else
   size_t size = strlen (name) + strlen (value) + 2;
   char *expression;

   expression = (char *) xmalloc (size * sizeof (char));

   sprintf (expression, "%s=%s", name, value);
   putenv (expression);
 #if (defined (__FreeBSD__) && (__FreeBSD__ < 7)) \
    || defined (__MINGW32__) \
    ||(defined (__vxworks) && ! defined (__RTP__))
   /* On some systems like FreeBSD 6.x and earlier, MacOS X and Windows,
      putenv is making a copy of the expression string so we can free
      it after the call to putenv */
   free (expression);
 #endif
 #endif
 }

 char **
 __gnat_environ (void)
 {
 #if defined (VMS) || defined (RTX)
   /* Not implemented */
   return NULL;
 #elif defined (__MINGW32__)
   return _environ;
 #elif defined (sun)
   extern char **_environ;
   return _environ;
 #elif defined (__APPLE__) && !defined (__arm__)
   return *_NSGetEnviron ();
 #elif ! (defined (__vxworks))
   extern char **environ;
   return environ;
 #else
   return environ;
 #endif
 }

 void __gnat_unsetenv (char *name)
 {
 #if defined (VMS)
   /* Not implemented */
   return;
 #elif defined (__hpux__) || defined (sun) \
      || (defined (__vxworks) && ! defined (__RTP__)) \
      || defined (_AIX) || defined (__Lynx__)

   /* On Solaris and HP-UX there is no function to clear an environment
      variable. So we look for the variable in the environ table and delete it
      by setting the entry to NULL. This can clearly cause some memory leaks
      but free cannot be used on this context as not all strings in the environ
      have been allocated using malloc. To avoid this memory leak another
      method can be used. It consists in forcing the reallocation of all the
      strings in the environ table using malloc on the first call on the
      functions related to environment variable management. The disadvantage
      is that if a program makes a direct call to getenv the return string
      may be deallocated at some point. */
   /* Note that on AIX, unsetenv is not supported on 5.1 but it is on 5.3.
      As we are still supporting AIX 5.1 we cannot use unsetenv */
   char **env = __gnat_environ ();
   int index = 0;
   size_t size = strlen (name);

   while (env[index] != NULL) {
      if (strlen (env[index]) > size) {
        if (strstr (env[index], name) == env[index] &&
 	   env[index][size] == '=') {
 #if defined (__vxworks) && ! defined (__RTP__)
          /* on Vxworks we are sure that the string has been allocated using
             malloc */
          free (env[index]);
 #endif
          while (env[index] != NULL) {
           env[index]=env[index + 1];
           index++;
          }
        } else
            index++;
      } else
          index++;
   }
 #elif defined (__MINGW32__)
   /* On Windows platform putenv ("key=") is equivalent to unsetenv (a
      subsequent call to getenv ("key") will return NULL and not the "\0"
      string */
   size_t size = strlen (name) + 2;
   char *expression;
   expression = (char *) xmalloc (size * sizeof (char));

   sprintf (expression, "%s=", name);
   putenv (expression);
   free (expression);
 #else
   unsetenv (name);
 #endif
 }

 void __gnat_clearenv (void)
 {
 #if defined (VMS)
   /* not implemented */
   return;
 #elif defined (sun) \
   || (defined (__vxworks) && ! defined (__RTP__)) || defined (__Lynx__) \
   || defined (__PikeOS__)
   /* On Solaris, VxWorks (not RTPs), and Lynx there is no system
      call to unset a variable or to clear the environment so set all
      the entries in the environ table to NULL (see comment in
      __gnat_unsetenv for more explanation). */
   char **env = __gnat_environ ();
   int index = 0;

   while (env[index] != NULL) {
     env[index]=NULL;
     index++;
   }
 #elif defined (__MINGW32__) || defined (__FreeBSD__) || defined (__APPLE__) \
    || (defined (__vxworks) && defined (__RTP__)) || defined (__CYGWIN__) \
    || defined (__NetBSD__) || defined (__OpenBSD__) || defined (__rtems__)
   /* On Windows, FreeBSD and MacOS there is no function to clean all the
      environment but there is a "clean" way to unset a variable. So go
      through the environ table and call __gnat_unsetenv on all entries */
   char **env = __gnat_environ ();
   size_t size;

   while (env[0] != NULL) {
     size = 0;
     while (env[0][size] != '=')
       size++;
     /* create a string that contains "name" */
     size++;
     {
       char *expression;
       expression = (char *) xmalloc (size * sizeof (char));
       strncpy (expression, env[0], size);
       expression[size - 1] = 0;
       __gnat_unsetenv (expression);
       free (expression);
     }
   }
 #else
   clearenv ();
 #endif
 }

 #ifdef __cplusplus
 }
 #endif
	/****************************************************************************
	* *
	* GNAT COMPILER COMPONENTS *
	* *
	* E N V *
	* *
	* C Implementation File *
	* *
	* Copyright (C) 2005-2015, Free Software Foundation, Inc. *
	* *
	* GNAT is free software; you can redistribute it and/or modify it under *
	* terms of the GNU General Public License as published by the Free Soft- *
	* ware Foundation; either version 3, or (at your option) any later ver- *
	* sion. GNAT is distributed in the hope that it will be useful, but WITH- *
	* OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
	* or FITNESS FOR A PARTICULAR PURPOSE. *
	* *
	* As a special exception under Section 7 of GPL version 3, you are granted *
	* additional permissions described in the GCC Runtime Library Exception, *
	* version 3.1, as published by the Free Software Foundation. *
	* *
	* You should have received a copy of the GNU General Public License and *
	* a copy of the GCC Runtime Library Exception along with this program; *
	* see the files COPYING3 and COPYING.RUNTIME respectively. If not, see *
	* <http://www.gnu.org/licenses/>. *
	* *
	* GNAT was originally developed by the GNAT team at New York University. *
	* Extensive contributions were provided by Ada Core Technologies Inc. *
	* *
	****************************************************************************/

	#ifdef IN_RTS
	# include "tconfig.h"
	# include "tsystem.h"

	# include <sys/stat.h>
	# include <fcntl.h>
	# include <time.h>
	# ifdef VMS
	# include <unixio.h>
	# endif
	/* We don't have libiberty, so use malloc. */
	# define xmalloc(S) malloc (S)
	#else /* IN_RTS */
	# include "config.h"
	# include "system.h"
	#endif /* IN_RTS */

	#if defined (__MINGW32__)
	#include <stdlib.h>
	#endif

	#if defined (__APPLE__) && !defined (__arm__)
	/* On Darwin, _NSGetEnviron must be used for shared libraries; but it is not
	available on iOS. */
	#include <crt_externs.h>
	#endif

	#if defined (__vxworks)
	#if defined (__RTP__)
	/* On VxWorks 6 Real-Time process mode, environ is defined in unistd.h. */
	#include <unistd.h>
	#elif defined (VTHREADS)
	/* VTHREADS mode applies to both VxWorks 653 and VxWorks MILS. The
	inclusion of vThreadsData.h is necessary to workaround a bug with
	envLib.h on VxWorks MILS and VxWorks 653. */
	#include <vThreadsData.h>
	#include <envLib.h>
	#else
	/* This should work for kernel mode on both VxWorks 5 and VxWorks 6. */
	#include <envLib.h>

	/* In that mode environ is a macro which reference the following symbol.
	As the symbol is not defined in any VxWorks include files we declare
	it as extern. */
	extern char** ppGlobalEnviron;
	#endif
	#endif

	#ifdef __cplusplus
	extern "C" {
	#endif

	#ifdef VMS
	#include <vms/descrip.h>
	#endif

	#include "env.h"

	void
	__gnat_getenv (char name, int len, char **value)
	{
	*value = getenv (name);
	if (!*value)
	*len = 0;
	else
	len = strlen (value);

	return;
	}

	/* VMS specific declarations for set_env_value. */

	#ifdef VMS

	typedef struct _ile3
	{
	unsigned short len, code;
	__char_ptr32 adr;
	__char_ptr32 retlen_adr;
	} ile_s;

	#endif

	void
	__gnat_setenv (char name, char value)
	{
	#if defined (VMS)
	struct dsc$descriptor_s name_desc;
	$DESCRIPTOR (table_desc, "LNM$PROCESS");
	char *host_pathspec = value;
	char *copy_pathspec;
	int num_dirs_in_pathspec = 1;
	char *ptr;
	long status;

	name_desc.dsc$w_length = strlen (name);
	name_desc.dsc$b_dtype = DSC$K_DTYPE_T;
	name_desc.dsc$b_class = DSC$K_CLASS_S;
	name_desc.dsc$a_pointer = name; /* ??? Danger, not 64bit safe. */

	if (*host_pathspec == 0)
	/* deassign */
	{
	status = LIB$DELETE_LOGICAL (&name_desc, &table_desc);
	/* no need to check status; if the logical name is not
	defined, that's fine. */
	return;
	}

	ptr = host_pathspec;
	while (*ptr++)
	if (*ptr == ',')
	num_dirs_in_pathspec++;

	{
	int i, status;
	/* Alloca is guaranteed to be 32bit. */
	ile_s ile_array = alloca (sizeof (ile_s) (num_dirs_in_pathspec + 1));
	char *copy_pathspec = alloca (strlen (host_pathspec) + 1);
	char curr, next;

	strcpy (copy_pathspec, host_pathspec);
	curr = copy_pathspec;
	for (i = 0; i < num_dirs_in_pathspec; i++)
	{
	next = strchr (curr, ',');
	if (next == 0)
	next = strchr (curr, 0);

	*next = 0;
	ile_array[i].len = strlen (curr);

	/* Code 2 from lnmdef.h means it's a string. */
	ile_array[i].code = 2;
	ile_array[i].adr = curr;

	/* retlen_adr is ignored. */
	ile_array[i].retlen_adr = 0;
	curr = next + 1;
	}

	/* Terminating item must be zero. */
	ile_array[i].len = 0;
	ile_array[i].code = 0;
	ile_array[i].adr = 0;
	ile_array[i].retlen_adr = 0;

	status = LIB$SET_LOGICAL (&name_desc, 0, &table_desc, 0, ile_array);
	if ((status & 1) != 1)
	LIB$SIGNAL (status);
	}

	#elif (defined (__vxworks) && defined (__RTP__)) \|\| defined (__APPLE__)
	setenv (name, value, 1);

	#else
	size_t size = strlen (name) + strlen (value) + 2;
	char *expression;

	expression = (char ) xmalloc (size sizeof (char));

	sprintf (expression, "%s=%s", name, value);
	putenv (expression);
	#if (defined (__FreeBSD__) && (__FreeBSD__ < 7)) \
	\|\| defined (__MINGW32__) \
	\|\|(defined (__vxworks) && ! defined (__RTP__))
	/* On some systems like FreeBSD 6.x and earlier, MacOS X and Windows,
	putenv is making a copy of the expression string so we can free
	it after the call to putenv */
	free (expression);
	#endif
	#endif
	}

	char **
	__gnat_environ (void)
	{
	#if defined (VMS) \|\| defined (RTX)
	/* Not implemented */
	return NULL;
	#elif defined (__MINGW32__)
	return _environ;
	#elif defined (sun)
	extern char **_environ;
	return _environ;
	#elif defined (__APPLE__) && !defined (__arm__)
	return *_NSGetEnviron ();
	#elif ! (defined (__vxworks))
	extern char **environ;
	return environ;
	#else
	return environ;
	#endif
	}

	void __gnat_unsetenv (char *name)
	{
	#if defined (VMS)
	/* Not implemented */
	return;
	#elif defined (__hpux__) \|\| defined (sun) \
	\|\| (defined (__vxworks) && ! defined (__RTP__)) \
	\|\| defined (_AIX) \|\| defined (__Lynx__)

	/* On Solaris and HP-UX there is no function to clear an environment
	variable. So we look for the variable in the environ table and delete it
	by setting the entry to NULL. This can clearly cause some memory leaks
	but free cannot be used on this context as not all strings in the environ
	have been allocated using malloc. To avoid this memory leak another
	method can be used. It consists in forcing the reallocation of all the
	strings in the environ table using malloc on the first call on the
	functions related to environment variable management. The disadvantage
	is that if a program makes a direct call to getenv the return string
	may be deallocated at some point. */
	/* Note that on AIX, unsetenv is not supported on 5.1 but it is on 5.3.
	As we are still supporting AIX 5.1 we cannot use unsetenv */
	char **env = __gnat_environ ();
	int index = 0;
	size_t size = strlen (name);

	while (env[index] != NULL) {
	if (strlen (env[index]) > size) {
	if (strstr (env[index], name) == env[index] &&
	env[index][size] == '=') {
	#if defined (__vxworks) && ! defined (__RTP__)
	/* on Vxworks we are sure that the string has been allocated using
	malloc */
	free (env[index]);
	#endif
	while (env[index] != NULL) {
	env[index]=env[index + 1];
	index++;
	}
	} else
	index++;
	} else
	index++;
	}
	#elif defined (__MINGW32__)
	/* On Windows platform putenv ("key=") is equivalent to unsetenv (a
	subsequent call to getenv ("key") will return NULL and not the "\0"
	string */
	size_t size = strlen (name) + 2;
	char *expression;
	expression = (char ) xmalloc (size sizeof (char));

	sprintf (expression, "%s=", name);
	putenv (expression);
	free (expression);
	#else
	unsetenv (name);
	#endif
	}

	void __gnat_clearenv (void)
	{
	#if defined (VMS)
	/* not implemented */
	return;
	#elif defined (sun) \
	\|\| (defined (__vxworks) && ! defined (__RTP__)) \|\| defined (__Lynx__) \
	\|\| defined (__PikeOS__)
	/* On Solaris, VxWorks (not RTPs), and Lynx there is no system
	call to unset a variable or to clear the environment so set all
	the entries in the environ table to NULL (see comment in
	__gnat_unsetenv for more explanation). */
	char **env = __gnat_environ ();
	int index = 0;

	while (env[index] != NULL) {
	env[index]=NULL;
	index++;
	}
	#elif defined (__MINGW32__) \|\| defined (__FreeBSD__) \|\| defined (__APPLE__) \
	\|\| (defined (__vxworks) && defined (__RTP__)) \|\| defined (__CYGWIN__) \
	\|\| defined (__NetBSD__) \|\| defined (__OpenBSD__) \|\| defined (__rtems__)
	/* On Windows, FreeBSD and MacOS there is no function to clean all the
	environment but there is a "clean" way to unset a variable. So go
	through the environ table and call __gnat_unsetenv on all entries */
	char **env = __gnat_environ ();
	size_t size;

	while (env[0] != NULL) {
	size = 0;
	while (env[0][size] != '=')
	size++;
	/* create a string that contains "name" */
	size++;
	{
	char *expression;
	expression = (char ) xmalloc (size sizeof (char));
	strncpy (expression, env[0], size);
	expression[size - 1] = 0;
	__gnat_unsetenv (expression);
	free (expression);
	}
	}
	#else
	clearenv ();
	#endif
	}

	#ifdef __cplusplus
	}
	#endif